Advertisement for orthosearch.org.uk
Results 1 - 2 of 2
Results per page:
The Bone & Joint Journal
Vol. 97-B, Issue 5 | Pages 611 - 616
1 May 2015
Shin WC Lee SM Lee KW Cho HJ Lee JS Suh KT

There is no single standardised method of measuring the orientation of the acetabular component on plain radiographs after total hip arthroplasty. We assessed the reliability and accuracy of three methods of assessing anteversion of the acetabular component for 551 THAs using the PolyWare software and the methods of Liaw et al, and of Woo and Morrey. All measurements of the three methods had excellent intra- and inter-observer reliability. The values of the PolyWare software, which determines version of the acetabular component by edge detection were regarded as the reference standard. Although the PolyWare software and the method of Liaw et al were similarly precise, the method of Woo and Morrey was significantly less accurate (p < 0.001). The method of Liaw et al seemed to be more accurate than that of Woo and Morrey when compared with the measurements using the PolyWare software. If the qualified lateral radiograph was selected, anteversion measured using the method of Woo and Morrey was considered to be relatively reliable.

Cite this article: Bone Joint J 2015; 97-B:611–16.


Orthopaedic Proceedings
Vol. 92-B, Issue SUPP_I | Pages 158 - 159
1 Mar 2010
Cho HJ Chang CB Kim TK
Full Access

Introduction: Mobile bearing TKA systems have drawn great attention as an alternative solution for the limitations of fixed bearing designs. Recently rotating platform posterior stabilized (RP-PS) was developed to take advantage of the benefits originating from the design features of the traditional rotating platform mobile bearing system and the traditional posterior stabilized fixed bearing system with post and cam mechanism. Despite its theoretical advantages, the clinical outcomes of TKAs with RP-PS mobile bearing system remain to be determined. In theory, compared to fixed bearing systems, clinical performances of mobile bearing knees may be more sensitive to the rehabilitation status due to its relatively small constraint by the prostheses. Therefore, the clinical outcomes can be vary with the follow-up periods. This study was conducted to compare the longitudinal clinical outcomes of TKAs with a RP-PS mobile system and with a floating platform mobile bearing system. Methods: 163 TKAs with one of two mobile bearing systems (E.motion-FP and E.motion-PS: B.Braun-Aesculap, Tuttlingen, Germany) were included in this study. All surgeries were performed by a single surgeon using a computer assisted navigation system (Orthopilot, B.Braun-Aesculap). Clinical outcomes evaluated at 6 months, 12 months, and 24 months were compared between the 70 knees with E.motion-FP and the 93 knees with E.motion-PS. Radiographic measurements of limb alignment and implant positioning showed no significant differences between the two groups.

Results: Compared to TKAs with the FP prosthesis, TKAs with the RP-PS prosthesis had greater maximum flexion (128.9 vs. 135.3, p = 0.001) and tended to be more satisfactory (satisfaction level: 3.4 vs. 3.1, p = 0.052). The other clinical outcome scales (AKS knee and function, PF, WOMAC, and SF-36) showed comparable results. No failures were found in both groups. Conclusion: We found that TKAs with the RP-PS mobile bearing system have greater maximum flexion and patient satisfaction than TKAs with the FP mobile bearing system. The long term benefits 2009